Grid harmonics compensation by using high-power PWM converters based on combination approach
Grid harmonics compensation by using high-power PWM converters based on combination approach
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DOI：
10.1109/jestpe.2015.2463230
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
Ye Zhang;Y. Li
中科院分区：
文献类型：
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作者：
Ye Zhang;Y. Li
对于大功率PWM变换器，通常采用选择性谐波消除（SHE）调制方案来减少低开关频率引起的低次谐波。然而，SHE方案本身缺乏主动补偿电网背景谐波的能力。为了使SHE调制的PWM变换器的有源补偿能力，一个选择性谐波补偿（SHC）方案和SHE相位抖动方法已在以前的工作中提出，并有效地主动衰减一个电网线电流谐波的大功率PWM电流源整流器（CSR）系统的应用程序进行了验证。然而，这两种方法都难以同时补偿两个谐波，这限制了它们的应用与变换器系统的滤波器电路的低谐振频率。本文扩展了以前的研究，使大功率PWM变换器，以主动补偿两个电网背景谐波。该方法不仅可以进一步减小电网线路电流畸变，而且使有源补偿的应用不再受滤波电路的限制。将其应用于大功率PWM CSR系统的实验结果验证了该方法的有效性。
For high-power PWM converters, selective harmonic elimination (SHE) modulation scheme is commonly adopted to reduce the low-order harmonics caused by low switching frequency. However, the SHE scheme itself lacks the capability to actively compensate the grid background harmonics. To enable the active compensation ability of the SHE-modulated PWM converters, a selective harmonic compensation (SHC) scheme and an SHE phase jittering method have been proposed in previous works, and their effectiveness to actively attenuate one grid line current harmonic were verified on a high-power PWM current-source rectifier (CSR) system application. Nevertheless, both of the two methods have difficulty in compensating two harmonics simultaneously, which limits their applications with a low resonant frequency of converter system's filter circuit. This paper extends the previous studies to enable the high-power PWM converters to actively compensate two grid background harmonics. The proposed method can not only further reduce the grid line current distortion, but also makes the application of the active compensation no longer limited by the filter circuit. Experimental results of its application on a high-power PWM CSR system are provided to verify the effectiveness.